 Autodesk Eagle is PCB design software for Windows Mac and Linux with a full version available via paid monthly subscription and a feature limited free edition with a maximum two signal layers and 12.4 inch board area. While Eagle itself is not open source software, the save schematic board and library files are in an XML format that's importable into KiCad. Eagle has a long history of use in the Maker hobbyist community, but includes a long list of pro level features. This can make the UI appear overwhelming at first, though the routing process itself becomes intuitive pretty quickly. The software is integrated with Autodesk's other cloud based 3D engineering and manufacturing design apps, so it's a good fit for those looking for a full product design approach.